Interesting that the generator produces about 20kW. The Tesla fast charger runs about 17 kW, which is just about the same rate that, on average, would be used driving at 60 MPH.

I would imagine that the Whitestar, being a bit bigger, would need a little more power. The Roadster also prevents the car from being driven when plugged into the charger, but that should be easy enough to overcome. The car could simply recognize that it is being charged by a mobile device, not a stationary one.